eeese



(No Model.)

EQL, REES OPERATING VALVES 0]? STEAM CYLINDERS. .No. 294, 07.

Patented Mar. 11, 1884.

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m m L n m IVY/1755555:

I IlNiTED STATES PATENT Q-FFICE.

EVAN L. REESE, OF NEXVAR-K, CALIFORNIA.

CPERATING VALVES OF STEAM-CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 294,807, dated Maieh11, 1883,

(No model.)

To aZZ whom, it may concern:

Be it known that I, EVAN L. REESE, a citizen of the United States,residing in Newark, county of Alameda, and State of California, havemade and invented certain new and use ful Improvements in OperatingValves of Steam-Cylinders; and I do hereby declare that the following isa full, clear, and exact description of the same, reference being-had tothe accompanying drawings by figures and letters.

My invention relates to novel mechanism for operating valves ofsteam-cylinders from the movements of the piston. It is particularlyapplicable to the valves of steam-pumps.

The following description fully explains the nature of my said inventionand the .mannerin which I proceed to construct, apply, use, and operateit.

In the accompanying drawings, Figure 1 is a longitudinal section througha steam-cylinder to which my valve mechanism is applied.

Fig. 2 is a similar view, showing the valve and piston at the oppositepositions from those given in Fig. 1.

My improvement consists in connecting the operating-rod of apiston-valve with a vibrating lever, and then operating this lever fromthe movements of the piston-rod of the principal or working cylinder bycertain novel mechanism which accommodates itself to the difference inthe length of movements of the two rods and causes the valves to openand close with a quick movement. Steam isadmitted into the valve-chamberat a point midway between the two valves, to produce equal pressure uponboth pistons and balance the valve. I construct and apply this operatingmechanism substantially as follows: The valves A A have seats in thebushings B, that are fitted into the ends of the valve-cylinder, asshown. In these bushings are the steam-passages d d. Thevalve-rod A iscarried on through a packing-gland, A in the cylinderhead, and has aloop, A, fixed to the end outside of the head. In a similar gland, B inthe head, over and in line with the steam piston-rod, I insert a stem,B, which is connected-with the piston or its rod in such manner that itis alternately drawn in and forced out a given lengtlrby thereciprocations of the piston. The outer end of this stem B is piston.

provided with a loop, B, and by means of a lever, E, carried throughthese two loops A V 13 the valve-rod A and stem B are connectedtogether. A fixed bracket, 0, on the cylinder-head forms a point ofattachment and the fulcrum for this lever. This fulcrumpoint is placedoutside of the valve-rod A, because the movements of the actuating-stemB andthe rod A actuated must take place in the same direction. Thedistance of this fulcrum-point from the rod A also determines the lengthof stroke of the valve-rod. The connection of the reversing-stem B withthe piston provides for a short movement of the stem at the end of eachstroke, with proper interval of rest after each movement, while thesteam-piston is traversing the cylinder. For this purpose the lower endof the stem is carried through the piston into a socket, b, in thepiston-rod, and a head, b, of larger diameter than the aperture f of theplate F, is formed on the end of the stem; The enlarged upper portion,b, of the stem B, outside of the piston-head, is also provided with ashoulder, b and between these two stops 1) b the plate F is carried bythe reciprocations of the piston, and caused tostrike them alternately.The distance between these two stops is determined by the length ofstroke of the steam- To produce a quick throw of the valve, I bring theend of the reversing-lever E in line with a yielding arm, G. having a.

cam-surface, 9, formed of a double incline, so that the end of thelever, when moved past the point g, will, by the pressure of this inclined surface against it, be thrown with a quick motion until arrestedby the stops 9* at the end of the incline, or by the end of loop B onthe stem, sufficient room or play for the lever E being provided in theloops to permit this movement. To attach this arm G, I fix on thecylinder-head a bracket, 0, having a hinge-connection for the lower endof the arm G, and a short upright post, 0', with a stud, c, to receiveand support a coil-spring, H, behind and in such position with the arm Gthat it is pressed constantly forward and held against the end of thelever; To regulate the force of the spring, I provide a movabletension-nut, h, on the back part of the stud,which can be set up asrequired.

The parts being thus applied, the operation is as follows: The valvesbeing in the position shown in Fig. 1, steam enters the lower inlet andthrough the ports behind the pistomwhich then, in moving toward theopposite end of the cylinder, slides along the reversing-stem until theplate F strikes the head on the end of the stem. This takes place at thetimein the stroke when it is required to cut oft the steam,

and for the remainder of the stroke the plate F draws upon the stem Band moves the point of the lever past the center of the cam-surface. Thevalves are then reversed and the return-stroke is made. At this time theparts will take the position shown in Fig. 2.

This valve mechanism is simple, effective, and not liable to becomederanged. It is very durable, and when broken is readily repaired by anymechanic of ordinary skill.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-- 1. The combination, with the valves A androd A, of the lever l", reversing-stem B, and

yielding arm G, having cam-surfaces 1 substantially as described.

2. The combination, with the valve-operating lever E, of thereversing-stem B, having the stops 1) I), and the yielding cam-platedarm G, as set forth.

3. The combination, with the reversing-1ever E, of the yielding arm (*r,having the inclines, substantially as set forth.

4:. In a valve mechanism actuated from the movements of the piston-rodof the workingeylinder, the reversing-stem 1, working in a slot or bore,I), in the piston-rod, and having the stops 1/ b", in combination withthe striking-plate F on the piston-head, reversing-le- 1 ver E, andspring pressure-arm G, provided with the inclines, substantially asherein speci- 1 fled.

EVAN L. REESE.

\Vitnesses: l Enwn. Osnonx, l G110. \"INOEXT.

